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Dairy Cattle And Reproduction

Subjects : industries, dairy
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Animal which has been castrated after puberty






2. 265-285 days






3. (male) Primary sex organ - produces sperm (male gamete) and male sex hormones - 2 total






4. Castration tool that uses a band around the testicles which cuts off circulation and eventually the testicles fall off






5. 1-3 days






6. Organ of copulation - provides passageway for semen and urine - muscular organ characterized especially by its spongy - erectile tissue that fills with blood






7. Parturition is controlled by...






8. Gonadotropic (GnRH) is (FSH and LH). Follical Stimulating (FSH) and Lutinizing Hormone (LH).






9. Can survive ~7 days in cow. vast majority <48 hours






10. Hold the penis in the bulls body when not in use. releases penis before ejaculation or urination.






11. 19-23 (21) days






12. (from Jersey Islands in Great Britain) Smallest cow - least milk - highest butterfat %






13. Actual heat cycle (period)






14. 1. sperm is not implanted in egg until hours after breeding. 2. fetal growth has not yet finished.






15. Why does estrus happen before ovulation?






16. 24 hours before end of estrus cycle






17. Milk made by mother which includes antibodies for the calf. MUST be given to the calf within the first 24 hrs of life. also provides calf with energy stores. effectiveness lasts from 4-8 months of age.






18. Milk ~305 days - dry 60 days prior to calving






19. Important 'landmark' during palpation






20. Can produce 200 calves naturally (~100 bulls) - top 1-2% will grade like him. everything left to chance if no AI performed






21. Duct through penis that carries sperm and urine






22. Castration tool which clamps down on the vans deferens. causes the sperm to not reach the penis to be ejaculated






23. 30 hours after estrus begins






24. Pulls sperm and egg together - gets body ready for pregnany - stimulates growth cells - develops mammary glands - starts to deposit fat.






25. 1. need to be restricted in amt of grain - 2. no more than 70% of ration can be concentrates. 3. *Acidic acid has to be produced in order for milk synthesis to occur (30% forages)






26. 1. seminiferous tubules - 2. sertoli cells - 3. leydid or interstitial cells






27. Boars and stallions-> deliver semen directly into the cervix. bulls and rams-> deliver semen into the vagina.






28. 19-23 (21) days






29. Examine accessory glands - also to know how big the pelvic opening is->heritable->relates to how much dystocia that bull's daughter has






30. 1. brain function - 2. blood flow - 3. willing female






31. Birthing process (termination of gestation)






32. Way to know everything is alright with the breeding male






33. Start of the reproductive tract for the female. located outside of the body






34. Small tubes located at the upper ends of the uterine horns. connects uterine horn to infundibulum. passageway of the egg.






35. 45-60 days after breeding; re-breed as required






36. 1. reproduction - 2. mastitis/udder problems - 3. low milk production - 4. soundness/poor feet and legs (living on concrete)






37. Birthing process (termination of gestation)






38. Failure to have one testis (gonad) to descend






39. ~60 days before calving






40. 1. visual evaluation - 2. scrotal circumference - 3. penis and prepuce observation - 4. rectal palpation - 5. libido test - 6. semen evaluation






41. 336 days






42. (LH) stimulates the Leydig cells to produce testosterone






43. Head - neck - mid-piece - tail. genetic material - has an enzyme covering that allows it to penetrate the egg






44. Not under a timeline - cow can not be sold as steak






45. ~305 days (altough often longer due to breeding difficulties)






46. Actual heat cycle (period)






47. 336 days






48. What about the sperm for a bull which has been castrated but still has testicles?






49. Luteolysis happens because of the ____________ hormone






50. 16-20 hours